Do I need to remove the application?

Question

I am working on iPlanet 6.0SP4.Do i need to remove the old application when I redeploy the new one. Because there is also an option called "override" when doing the deployment, what that mean?
If I didn't remove the application, and redeploy with override option, is it possible that two same classes will be stored in the ldap server with different id

Answer 1

Hi,
See when you deploy any ear application it first copy it in "<iAS-install-dir>/ias/JAR" dir and extract all the war/jar modules in it. And after it picks the modules from here and explode in respective directory under "<iAS-install-dir>/ias/APPS or .../APPS/modules". When you say Override modules, it replaces all the old modules having the same name with the new one and then explode them.
Moreover when you deploy any module it will make entries in LDAP under "Application server/6.0/J2EE-Modules/<war/jar-module-name>" and for each Servlet/JSP/EJB under "Application server/ClassDef/<GUID>".
So when you redeploy same application again and you don't change the module names then it will overwrite this registry information as the module names and GUID is same (in this case you have to restart iAS). But if you reassemble application using deploytool, then it will create new GUIDs for each components in your app and the second entry will be change in this case.
Now when ever plugin will send the request for the new app it will read GUID from the "J2EE-Modules/<war/jar-module-name>" node and will send it to the KXS and the KXS will see what class to load after looking at "ClassDef/<GUID>" node.
If the modules have the same name as original Application, then the old GUID entries in registry are of no use and will make iAS slow only as it reads the whole registry while starting.
Please feel free to ask further questions.
Sanjeev,
Developer Support, Sun ONE Application Server-India.